The mailing list for listmasters using Sympa

[Ruud Baart <address@concealed>]

I have installed a new debian trixie (13.3) server. The old one was 
debian bullseye (11.11).

On the old one I used to install sympa from the sources. For a very long 
time I had no problems with sympa.

So I installed the same version on the new server. In fact I used rsync 
to copy the installation, including the postfix configuration and then I 
compiled sympa on the new server with the same script.

./configure \
    --prefix=/usr/local/sympa \
    --without-smrshdir \
    --with-lockdir=/var/lock/subsys \
    --with-piddir=/run/sympa \
    --with-initdir=/etc/init.d \
    --with-unitsdir=/etc/systemd/system \
    --with-aliases_file=/etc/postfix/sympa_aliases

In postfix master.cf

sympa   unix    -       n       n       -       -       pipe
  flags=hqRu null_sender= user=sympa argv=/usr/local/sympa/bin/queue 
${nexthop}
sympabounce unix -      n       n       -       -       pipe
  flags=hqRu null_sender= user=sympa 
argv=/usr/local/sympa/bin/bouncequeue ${nexthop}

Sympa runs on the new server but there is something wrong. When I send a 
message to the list on the new server I see no error but the message is 
not delivered. Postfix mailq:

 mailq
-Queue ID-  --Size-- ----Arrival Time---- -Sender/Recipient-------
2BAF05F444D    2700 Mon Feb  2 18:26:18  address@concealed
(temporary failure. Command output: /usr/local/sympa/bin/queue: while 
opening queue file 'T.listserver.prompt.nl.1770053178.1208809': 
Read-only file system)
 address@concealed

However if I use /usr/local/sympa/bin/queue directly, mail is delivered:

    cat testmail |/usr/local/sympa/bin/queue address@concealed

I can't find what's wrong. Please help